在webpack 4项目中使用Jest引发“Jest遇到意外的token”错误

npm install jest babel-jest babel-preset-jest --save-dev

module.exports = {
  // ...
  module: {
    rules: [
      // ...
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
    ],
  },
  // ...
};

module.exports = {
  // ...
  resolve: {
    alias: {
      '^.+\\.(css|less|scss)$': 'babel-jest',
    },
  },
  // ...
};

module.exports = {
  // ...
  module: {
    rules: [
      // ...
      {
        test: /\.(ts|tsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react', '@babel/preset-typescript'],
          },
        },
      },
    ],
  },
  resolve: {
    extensions: ['.ts', '.tsx', '.js', '.jsx'],
    alias: {
      '^.+\\.(css|less|scss)$': 'babel-jest',
    },
  },
  // ...
};

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}